Deep phase modulation interferometry

Gerhard Heinzel, Felipe Guzmán Cervantes, Antonio F. García Marín, Joachim Kullmann, Wang Feng, Karsten Danzmann

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


We have developed a method to equip homodyne interferometers with the capability to operate with constant high sensitivity over many fringes for continuous real-time tracking. The method can be considered as an extension of the "J1 . . .J4" methods, and its enhancement to deliver very sensitive angular measurements through Differential Wavefront Sensing is straightforward. Beam generation requires a sinusoidal phase modulation of several radians in one interferometer arm. On a stable optical bench, we have demonstrated a long-term sensitivity over thousands of seconds of 0.1 mrad/ √ Hz that correspond to 20 pm/ √ Hz in length, and 10 nrad/ √ Hz in angle at millihertz frequencies.

Original languageEnglish (US)
Pages (from-to)19076-19086
Number of pages11
JournalOptics Express
Issue number18
StatePublished - Aug 30 2010
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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